Harris and william howell



octroi titer,

WASHINGTON HARRIS AND WILLIAM HOWELL, OF PHILADELPHIA, PENN l SYLVANIA.

Letters Patent N 102,116, dated April 19, 1870.

IMPROVEMENT IN NON-CONDUCTING COVERING FOR STEAM-BOILERS.

The Bchedulu referred to in` those Lettore Patent and making punt of the name.

We, WAsnrNG'roN HAurus and WrLLiAM How- ELL, of the city otf'Philadelphia, in ther State oi lenn- Sylvania, haveim'cuted certain Improvements in Non- Conducting Coverings for Steam-Pipes, Drums, Lienerators, and other heated vessels, ot' which the following is a specification.

Nature ami Objects of thc Invention.

The first part of our invention relates to the use of ground or grand ated cork, in combination with ploster of laris and hair, or other equivalent materials, as a. non-conducting covering l'or steam-pipes, drums, generators, &c. Y

The second part of our invention relates to the confinement oi' a stratum ol' air around steam-pipes, drums, and over the exposed suri'nces oi" steam-geuemtors, &c., by means of tin plates, or other thin sheet metal, applied no yne to produce a close aireharnber' around between the salti sheet metal and the heated vessel, and then covering the said sheet metal with a thick stratum ci' ground or granulated cork, or of ground orgranulated cork in combination with plasterI of Iaris and hair, or any other suitable 'material or materials; the object ot' our invention being to produce a more eiective and reliable covering, i'or preventing the loss of lient hy radiation or conduction. l'

Description of the Accompanying Drawings.

Figure l is a, transverse section ot a steam-pipe, showing the surrounding air-chan1ber i'ormed by the sheet metal, and thepntcrcovering of the ground or granulated cork, in combination with plaster of Paris and hair. v

Figure 2 is a' like transverse section of the steampipe, and the surrounding air-chamber formed by the sheet metal, but covered with a thick stratum of ground or granulated cork, retained h v an outside easing of sheet metal.

Generar` Description.

Letters Patent numbered 98,865, and dated January 18, 1870, were issued to WASHINGTON Harmrs, one ofthe present applicants, for non-conducting covering for boilers, steam-pipes, &c., the said cover ing consisting oi' shells cr tiles, so called, made oi plaster ofvlaris and lime, or ashes, and hair, cast. in molds,and-secured in sections around thc pipes, so 'as to produce a noncondncting covering, either with or without an'air-space between them and the pipe, as will more fully appear by reference to said patent.

In the present invention the air-chamber A is formed or produced by surrounding the pipe 1S with a jacket or casiug'oi' shcctnnetal, C, so as to confine a stratum oi air around the said pipe B, and then coverrug the same with shells or tiles, I) 1), consisting of about twenty per cent. of4 ground or granulated corlr, mixed with plaster ot Paris and hair, or their' equivalents, to cause the particles` of cork to adhere thick coating of the cork anni plaster compound,-applied in'its plastic state, or even by largo sections ot lshells or tiles, formed to correspond. i

\\c have found that ground or granulated cork alone, secured, in any suitablennanuer, in a thiclc stratum or covering (scol D', iig. 2) upon thooutside of the sheet metal O, which forms the air-chamber A described, makes n. very superior non-conductor, even after the cork muy have become charred from nn excess oi' heat in the pipe; and, therefore, we intend to use it in positions where it can readily be secured. upon the sheet-metal covering which produces the nir-space.

We are aware thatfelt hns been supported around. steam-pipes and boilers, by means of oper-i frame-work. of gas-pipes, or woven wire, so as to leave an airspace between the l'clt, or its equivalent non-conductor, andthe said steam-pipe or boiler; and that various non-condnctim,r substances have been combined with plaster ot' Paris, and, in a plastic condition, applied to form a non-conducting coveringr i'or such heated vessels; thcrcibrc,

Wcdo not desire to claim an air-chamberaround between a nou-conducting' covering and a steam-pipe or boiler; nor do we desire to claim the employment of plaster' of Iarisin a compound for covering the said vessels; but

What we desire to secure by Letters Patent is coniilfedto thc followingv Claims.

We claim as our ipvention- 1. In combination with plastergoi las and hair,

the use of ground or granulated cork, substantially in the proportion and manner described, for the purpose of producing the non-conducting coating for steam- 

